Name changed because I'm dying of embarrassment. I just had an incredibly low moment at a job interview and I'm ready to hide myself away for the rest of the day. They asked me a fairly simple knowledge question and my brain just blanked. I suddenly felt like I was in school being grilled by my maths teacher (it was a very exam-y interview). I just blabbered on and then just ended the misery by saying "Sorry, that was a really poor answer." We moved on, the rest was good, but I don't think it can recover this low point. I must have looked like I had lied about all of my experience to not be able to answer this one simple thing. So that's that. Only a dream job, who cares.
Please share your interview blunders and/or moments when your brain just went blank to make me feel better.